Defect engineering in two-dimensional perovskite nanowire arrays by europium(III) doping towards high-performance photodetection.

We demonstrate high-performance photodetectors based on Eu-doped 2D perovskite nanowire arrays. The pure crystallographic orientation enables efficient carrier transport and the doped Eu ions effectively suppress the trap density in the nanowire arrays. As a result, the optimized Eu-doped photodetectors show an excellent responsivity of 6.24 A W -1 , an outstanding specific detectivity of 5.83 × 10 13 Jones and stable photo-switching behavior with a current on/off ratio of 10 3 .